underfloor
adjective/ˌʌndəˈflɔː(r)/
/ˌʌndərˈflɔːr/
[only before noun]- placed under the floor
- underfloor heating
Oxford Collocations DictionaryUnderfloor is used with these nouns:- heating
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underfloor
Definition of underfloor adjective from the Oxford Advanced Learner's Dictionary